summaryrefslogtreecommitdiff
path: root/libavformat/xmv.c
blob: 6fa9a6a0a7fb37f74ca90ab7f652e6a0809cf3b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
/*
 * Microsoft XMV demuxer
 * Copyright (c) 2011 Sven Hesse <drmccoy@drmccoy.de>
 * Copyright (c) 2011 Matthew Hoops <clone2727@gmail.com>
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Microsoft XMV demuxer
 */

#include <stdint.h>

#include "libavutil/intreadwrite.h"

#include "avformat.h"
#include "internal.h"
#include "riff.h"

#define XMV_MIN_HEADER_SIZE 36

#define XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT 1
#define XMV_AUDIO_ADPCM51_FRONTCENTERLOW 2
#define XMV_AUDIO_ADPCM51_REARLEFTRIGHT  4

#define XMV_AUDIO_ADPCM51 (XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT | \
                           XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \
                           XMV_AUDIO_ADPCM51_REARLEFTRIGHT)

typedef struct XMVAudioTrack {
    uint16_t compression;
    uint16_t channels;
    uint32_t sample_rate;
    uint16_t bits_per_sample;
    uint32_t bit_rate;
    uint16_t flags;
    uint16_t block_align;
    uint16_t block_samples;

    enum CodecID codec_id;
} XMVAudioTrack;

typedef struct XMVVideoPacket {
    /* The decoder stream index for this video packet. */
    int stream_index;

    uint32_t data_size;
    uint32_t data_offset;

    uint32_t current_frame;
    uint32_t frame_count;

    /* Does the video packet contain extra data? */
    int has_extradata;

    /* Extra data */
    uint8_t extradata[4];

    int64_t last_pts;
    int64_t pts;
} XMVVideoPacket;

typedef struct XMVAudioPacket {
    /* The decoder stream index for this audio packet. */
    int stream_index;

    /* The audio track this packet encodes. */
    XMVAudioTrack *track;

    uint32_t data_size;
    uint32_t data_offset;

    uint32_t frame_size;

    uint32_t block_count;
} XMVAudioPacket;

typedef struct XMVDemuxContext {
    uint16_t audio_track_count;

    XMVAudioTrack *audio_tracks;

    uint32_t this_packet_size;
    uint32_t next_packet_size;

    uint32_t this_packet_offset;
    uint32_t next_packet_offset;

    uint16_t current_stream;
    uint16_t stream_count;

    XMVVideoPacket  video;
    XMVAudioPacket *audio;
} XMVDemuxContext;

static int xmv_probe(AVProbeData *p)
{
    uint32_t file_version;

    if (p->buf_size < XMV_MIN_HEADER_SIZE)
        return 0;

    file_version = AV_RL32(p->buf + 16);
    if ((file_version == 0) || (file_version > 4))
        return 0;

    if (!memcmp(p->buf + 12, "xobX", 4))
        return AVPROBE_SCORE_MAX;

    return 0;
}

static int xmv_read_header(AVFormatContext *s)
{
    XMVDemuxContext *xmv = s->priv_data;
    AVIOContext     *pb  = s->pb;
    AVStream        *vst = NULL;

    uint32_t file_version;
    uint32_t this_packet_size;
    uint16_t audio_track;

    avio_skip(pb, 4); /* Next packet size */

    this_packet_size = avio_rl32(pb);

    avio_skip(pb, 4); /* Max packet size */
    avio_skip(pb, 4); /* "xobX" */

    file_version = avio_rl32(pb);
    if ((file_version != 4) && (file_version != 2))
        av_log_ask_for_sample(s, "Found uncommon version %d\n", file_version);


    /* Video track */

    vst = avformat_new_stream(s, NULL);
    if (!vst)
        return AVERROR(ENOMEM);

    avpriv_set_pts_info(vst, 32, 1, 1000);

    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    vst->codec->codec_id   = CODEC_ID_WMV2;
    vst->codec->codec_tag  = MKBETAG('W', 'M', 'V', '2');
    vst->codec->width      = avio_rl32(pb);
    vst->codec->height     = avio_rl32(pb);

    vst->duration          = avio_rl32(pb);

    xmv->video.stream_index = vst->index;

    /* Audio tracks */

    xmv->audio_track_count = avio_rl16(pb);

    avio_skip(pb, 2); /* Unknown (padding?) */

    xmv->audio_tracks = av_malloc(xmv->audio_track_count * sizeof(XMVAudioTrack));
    if (!xmv->audio_tracks)
        return AVERROR(ENOMEM);

    xmv->audio = av_malloc(xmv->audio_track_count * sizeof(XMVAudioPacket));
    if (!xmv->audio)
        return AVERROR(ENOMEM);

    for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
        XMVAudioTrack  *track  = &xmv->audio_tracks[audio_track];
        XMVAudioPacket *packet = &xmv->audio       [audio_track];
        AVStream *ast = NULL;

        track->compression     = avio_rl16(pb);
        track->channels        = avio_rl16(pb);
        track->sample_rate     = avio_rl32(pb);
        track->bits_per_sample = avio_rl16(pb);
        track->flags           = avio_rl16(pb);

        track->bit_rate      = track->bits_per_sample *
                               track->sample_rate *
                               track->channels;
        track->block_align   = 36 * track->channels;
        track->block_samples = 64;
        track->codec_id      = ff_wav_codec_get_id(track->compression,
                                                   track->bits_per_sample);

        packet->track        = track;
        packet->stream_index = -1;

        packet->frame_size  = 0;
        packet->block_count = 0;

        /* TODO: ADPCM'd 5.1 sound is encoded in three separate streams.
         *       Those need to be interleaved to a proper 5.1 stream. */
        if (track->flags & XMV_AUDIO_ADPCM51)
            av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream "
                                      "(0x%04X)\n", track->flags);

        ast = avformat_new_stream(s, NULL);
        if (!ast)
            return AVERROR(ENOMEM);

        ast->codec->codec_type            = AVMEDIA_TYPE_AUDIO;
        ast->codec->codec_id              = track->codec_id;
        ast->codec->codec_tag             = track->compression;
        ast->codec->channels              = track->channels;
        ast->codec->sample_rate           = track->sample_rate;
        ast->codec->bits_per_coded_sample = track->bits_per_sample;
        ast->codec->bit_rate              = track->bit_rate;
        ast->codec->block_align           = 36 * track->channels;

        avpriv_set_pts_info(ast, 32, track->block_samples, track->sample_rate);

        packet->stream_index = ast->index;

        ast->duration = vst->duration;
    }


    /** Initialize the packet context */

    xmv->next_packet_offset = avio_tell(pb);
    xmv->next_packet_size   = this_packet_size - xmv->next_packet_offset;
    xmv->stream_count       = xmv->audio_track_count + 1;

    return 0;
}

static void xmv_read_extradata(uint8_t *extradata, AVIOContext *pb)
{
    /* Read the XMV extradata */

    uint32_t data = avio_rl32(pb);

    int mspel_bit        = !!(data & 0x01);
    int loop_filter      = !!(data & 0x02);
    int abt_flag         = !!(data & 0x04);
    int j_type_bit       = !!(data & 0x08);
    int top_left_mv_flag = !!(data & 0x10);
    int per_mb_rl_bit    = !!(data & 0x20);
    int slice_count      = (data >> 6) & 7;

    /* Write it back as standard WMV2 extradata */

    data = 0;

    data |= mspel_bit        << 15;
    data |= loop_filter      << 14;
    data |= abt_flag         << 13;
    data |= j_type_bit       << 12;
    data |= top_left_mv_flag << 11;
    data |= per_mb_rl_bit    << 10;
    data |= slice_count      <<  7;

    AV_WB32(extradata, data);
}

static int xmv_process_packet_header(AVFormatContext *s)
{
    XMVDemuxContext *xmv = s->priv_data;
    AVIOContext     *pb  = s->pb;

    uint8_t  data[8];
    uint16_t audio_track;
    uint32_t data_offset;

    /* Next packet size */
    xmv->next_packet_size = avio_rl32(pb);

    /* Packet video header */

    if (avio_read(pb, data, 8) != 8)
        return AVERROR(EIO);

    xmv->video.data_size     = AV_RL32(data) & 0x007FFFFF;

    xmv->video.current_frame = 0;
    xmv->video.frame_count   = (AV_RL32(data) >> 23) & 0xFF;

    xmv->video.has_extradata = (data[3] & 0x80) != 0;

    /* Adding the audio data sizes and the video data size keeps you 4 bytes
     * short for every audio track. But as playing around with XMV files with
     * ADPCM audio showed, taking the extra 4 bytes from the audio data gives
     * you either completely distorted audio or click (when skipping the
     * remaining 68 bytes of the ADPCM block). Substracting 4 bytes for every
     * audio track from the video data works at least for the audio. Probably
     * some alignment thing?
     * The video data has (always?) lots of padding, so it should work out...
     */
    xmv->video.data_size -= xmv->audio_track_count * 4;

    xmv->current_stream = 0;
    if (!xmv->video.frame_count) {
        xmv->video.frame_count = 1;
        xmv->current_stream    = 1;
    }

    /* Packet audio header */

    for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
        XMVAudioPacket *packet = &xmv->audio[audio_track];

        if (avio_read(pb, data, 4) != 4)
            return AVERROR(EIO);

        packet->data_size = AV_RL32(data) & 0x007FFFFF;
        if ((packet->data_size == 0) && (audio_track != 0))
            /* This happens when I create an XMV with several identical audio
             * streams. From the size calculations, duplicating the previous
             * stream's size works out, but the track data itself is silent.
             * Maybe this should also redirect the offset to the previous track?
             */
            packet->data_size = xmv->audio[audio_track - 1].data_size;

        /** Carve up the audio data in frame_count slices */
        packet->frame_size  = packet->data_size  / xmv->video.frame_count;
        packet->frame_size -= packet->frame_size % packet->track->block_align;
    }

    /* Packet data offsets */

    data_offset = avio_tell(pb);

    xmv->video.data_offset = data_offset;
    data_offset += xmv->video.data_size;

    for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
        xmv->audio[audio_track].data_offset = data_offset;
        data_offset += xmv->audio[audio_track].data_size;
    }

    /* Video frames header */

    /* Read new video extra data */
    if (xmv->video.data_size > 0) {
        if (xmv->video.has_extradata) {
            xmv_read_extradata(xmv->video.extradata, pb);

            xmv->video.data_size   -= 4;
            xmv->video.data_offset += 4;

            if (xmv->video.stream_index >= 0) {
                AVStream *vst = s->streams[xmv->video.stream_index];

                assert(xmv->video.stream_index < s->nb_streams);

                if (vst->codec->extradata_size < 4) {
                    av_free(vst->codec->extradata);

                    vst->codec->extradata =
                        av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
                    vst->codec->extradata_size = 4;
                }

                memcpy(vst->codec->extradata, xmv->video.extradata, 4);
            }
        }
    }

    return 0;
}

static int xmv_fetch_new_packet(AVFormatContext *s)
{
    XMVDemuxContext *xmv = s->priv_data;
    AVIOContext     *pb  = s->pb;
    int result;

    /* Seek to it */
    xmv->this_packet_offset = xmv->next_packet_offset;
    if (avio_seek(pb, xmv->this_packet_offset, SEEK_SET) != xmv->this_packet_offset)
        return AVERROR(EIO);

    /* Update the size */
    xmv->this_packet_size = xmv->next_packet_size;
    if (xmv->this_packet_size < (12 + xmv->audio_track_count * 4))
        return AVERROR(EIO);

    /* Process the header */
    result = xmv_process_packet_header(s);
    if (result)
        return result;

    /* Update the offset */
    xmv->next_packet_offset = xmv->this_packet_offset + xmv->this_packet_size;

    return 0;
}

static int xmv_fetch_audio_packet(AVFormatContext *s,
                                  AVPacket *pkt, uint32_t stream)
{
    XMVDemuxContext *xmv   = s->priv_data;
    AVIOContext     *pb    = s->pb;
    XMVAudioPacket  *audio = &xmv->audio[stream];

    uint32_t data_size;
    uint32_t block_count;
    int result;

    /* Seek to it */
    if (avio_seek(pb, audio->data_offset, SEEK_SET) != audio->data_offset)
        return AVERROR(EIO);

    if ((xmv->video.current_frame + 1) < xmv->video.frame_count)
        /* Not the last frame, get at most frame_size bytes. */
        data_size = FFMIN(audio->frame_size, audio->data_size);
    else
        /* Last frame, get the rest. */
        data_size = audio->data_size;

    /* Read the packet */
    result = av_get_packet(pb, pkt, data_size);
    if (result <= 0)
        return result;

    pkt->stream_index = audio->stream_index;

    /* Calculate the PTS */

    block_count = data_size / audio->track->block_align;

    pkt->duration = block_count;
    pkt->pts      = audio->block_count;
    pkt->dts      = AV_NOPTS_VALUE;

    audio->block_count += block_count;

    /* Advance offset */
    audio->data_size   -= data_size;
    audio->data_offset += data_size;

    return 0;
}

static int xmv_fetch_video_packet(AVFormatContext *s,
                                  AVPacket *pkt)
{
    XMVDemuxContext *xmv   = s->priv_data;
    AVIOContext     *pb    = s->pb;
    XMVVideoPacket  *video = &xmv->video;

    int result;
    uint32_t frame_header;
    uint32_t frame_size, frame_timestamp;
    uint32_t i;

    /* Seek to it */
    if (avio_seek(pb, video->data_offset, SEEK_SET) != video->data_offset)
        return AVERROR(EIO);

    /* Read the frame header */
    frame_header = avio_rl32(pb);

    frame_size      = (frame_header & 0x1FFFF) * 4 + 4;
    frame_timestamp = (frame_header >> 17);

    if ((frame_size + 4) > video->data_size)
        return AVERROR(EIO);

    /* Create the packet */
    result = av_new_packet(pkt, frame_size);
    if (result)
        return result;

    /* Contrary to normal WMV2 video, the bit stream in XMV's
     * WMV2 is little-endian.
     * TODO: This manual swap is of course suboptimal.
     */
    for (i = 0; i < frame_size; i += 4)
        AV_WB32(pkt->data + i, avio_rl32(pb));

    pkt->stream_index = video->stream_index;

    /* Calculate the PTS */

    video->last_pts = frame_timestamp + video->pts;

    pkt->duration = 0;
    pkt->pts      = video->last_pts;
    pkt->dts      = AV_NOPTS_VALUE;

    video->pts += frame_timestamp;

    /* Keyframe? */
    pkt->flags = (pkt->data[0] & 0x80) ? 0 : AV_PKT_FLAG_KEY;

    /* Advance offset */
    video->data_size   -= frame_size + 4;
    video->data_offset += frame_size + 4;

    return 0;
}

static int xmv_read_packet(AVFormatContext *s,
                           AVPacket *pkt)
{
    XMVDemuxContext *xmv = s->priv_data;
    int result;

    if (xmv->video.current_frame == xmv->video.frame_count) {
        /* No frames left in this packet, so we fetch a new one */

        result = xmv_fetch_new_packet(s);
        if (result)
            return result;
    }

    if (xmv->current_stream == 0) {
        /* Fetch a video frame */

        result = xmv_fetch_video_packet(s, pkt);
        if (result)
            return result;

    } else {
        /* Fetch an audio frame */

        result = xmv_fetch_audio_packet(s, pkt, xmv->current_stream - 1);
        if (result)
            return result;
    }

    /* Increase our counters */
    if (++xmv->current_stream >= xmv->stream_count) {
        xmv->current_stream       = 0;
        xmv->video.current_frame += 1;
    }

    return 0;
}

static int xmv_read_close(AVFormatContext *s)
{
    XMVDemuxContext *xmv = s->priv_data;

    av_free(xmv->audio);
    av_free(xmv->audio_tracks);

    return 0;
}

AVInputFormat ff_xmv_demuxer = {
    .name           = "xmv",
    .long_name      = NULL_IF_CONFIG_SMALL("Microsoft XMV"),
    .priv_data_size = sizeof(XMVDemuxContext),
    .read_probe     = xmv_probe,
    .read_header    = xmv_read_header,
    .read_packet    = xmv_read_packet,
    .read_close     = xmv_read_close,
};